package com.example.demo.huawei;

import java.util.Arrays;
import java.util.Scanner;
/*
TODO 压根读不懂题目
https://blog.csdn.net/banxia_frontend/article/details/134700976
 */

public class Main23 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.nextLine();
        smallestLength(s);
    }

    private static void smallestLength(String s) {
        char[] array = s.toCharArray();
        Arrays.sort(array);
        System.out.println(new String(array));
    }
}
